Lm l the abscissa in fig 636a x vm v v l 1 2 25697181

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Unformatted text preview: ement of the ordinate of Fig. 6.36a, uo = Y FP V f { L } f { L } 32.2 62.4 1 = 812 (ft/s)2 and uo = 28.5 ft/s 14 0.039 1(0.77) 32.2 62.4 1 2 For Montz, uo = 0.17 = 345 (ft/s)2 and uo = 18.6 ft/s 33 0.039 1(0.77) For fraction of flooding = f = 0.7, uV = uo f = 28.5(0.7) = 20.0 ft/s for NOR PAC, uV = uo f = 18.6(0.7) = 13.0 ft/s for Montz. 2 For NOR PAC, uo = 0.17 4VM V From Eq. (6-103), column diameter = DT = fu0 V 1/ 2 4VM V = uV V 1/ 2 Analysis: (b) (continued) Exercise 7.52 (continued) 1/ 2 4(1367.8 / 3600)(18.1) For NOR PAC, DT = 20(3.14)(0.039) = 3.4 ft. 1/ 2 4(1367.8 / 3600)(18.1) For Montz, DT = = 4.2 ft 13.0(3.14)(0.039) (a) For liquid holdup estimates, assume the column operates in the preloading region. Therefore, the holdup is independent of the gas rate. Follow Example 6.12. Pertinent packing characteristics from Table 6.8: Ch Packing a, m2/m3 a, ft2/ft3 NOR PAC 86.8 26.5 0.947 0.651 Montz 300 91.4 0.930 0.482 Use Eqs. (6-97) to (6-101), which requires calculating the liquid Reynolds and Froude numbers. Liquid holdup based on conditions at the...
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This note was uploaded on 09/08/2008 for the course CHE 244 taught by Professor Selebi during the Spring '06 term at Lehigh University .

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